/**
* Licensed to the Austrian Association for Software Tool Integration (AASTI)
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. The AASTI licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.openengsb.persistence.context.filebackend;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.openengsb.core.api.model.ConfigItem;
import org.openengsb.core.api.model.ContextConfiguration;
import org.openengsb.core.api.model.ContextId;
import org.openengsb.core.api.persistence.ConfigPersistenceBackendService;
import org.openengsb.core.api.persistence.InvalidConfigurationException;
import org.openengsb.core.api.persistence.PersistenceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
public class ContextFilePersistenceService implements ConfigPersistenceBackendService<Map<String, String>> {
public static final String CONTEXT_FILE_EXTENSION = "context";
private File storageFolder;
private static final Logger LOGGER = LoggerFactory.getLogger(ContextFilePersistenceService.class);
@Override
public List<ConfigItem<Map<String, String>>> load(Map<String, String> metadata) throws PersistenceException,
InvalidConfigurationException {
LOGGER.debug("Loading Configuration");
if (metadata == null || metadata.isEmpty()) {
return loadAll();
} else {
return loadFiltered(metadata);
}
}
@SuppressWarnings("unchecked")
@Override
public void persist(ConfigItem<Map<String, String>> config) throws PersistenceException,
InvalidConfigurationException {
Preconditions.checkArgument(supports((Class<? extends ConfigItem<?>>) config.getClass()),
"Argument type not supported");
Preconditions.checkNotNull(config.getMetaData(), "Invalid metadata");
String contextFileName = getFileNameForMetaData(config.getMetaData());
File contextPersistenceFile = new File(storageFolder, contextFileName);
try {
FileUtils.touch(contextPersistenceFile);
} catch (IOException e) {
throw new PersistenceException(String.format("Could not persist context configuration file %s",
contextFileName), e);
}
LOGGER.info("Created context configuration file %s", contextFileName);
}
@Override
public void remove(Map<String, String> metadata) throws PersistenceException {
String contextFileName = getFileNameForMetaData(metadata);
File contextPersistenceFile = new File(storageFolder, contextFileName);
Boolean fileSuccessFullyDeleted = FileUtils.deleteQuietly(contextPersistenceFile);
if (!fileSuccessFullyDeleted) {
throw new PersistenceException(String.format("Could not delete context configuration file %s",
contextFileName));
}
LOGGER.info("Deleted context configuration file %s", contextFileName);
}
@Override
public boolean supports(Class<? extends ConfigItem<?>> configItemType) {
return ContextConfiguration.class.isAssignableFrom(configItemType);
}
private List<ConfigItem<Map<String, String>>> loadAll() {
Collection<File> contextFiles = FileUtils.listFiles(storageFolder, getContextExtensions(), false);
List<ConfigItem<Map<String, String>>> contexts = new ArrayList<ConfigItem<Map<String, String>>>();
for (File contextFile : contextFiles) {
contexts.add(loadContextConfigurationFromFile(contextFile));
}
return contexts;
}
private List<ConfigItem<Map<String, String>>> loadFiltered(Map<String, String> metaData)
throws PersistenceException {
List<ConfigItem<Map<String, String>>> configurations = new ArrayList<ConfigItem<Map<String, String>>>();
File configurationFile = new File(storageFolder, getFileNameForMetaData(metaData));
if (configurationFile.exists()) {
configurations.add(loadContextConfigurationFromFile(configurationFile));
}
return configurations;
}
private String getFileNameForMetaData(Map<String, String> metaData) throws PersistenceException {
ContextId contextId = ContextId.fromMetaData(metaData);
return String.format("%s.%s", contextId.getId(), CONTEXT_FILE_EXTENSION);
}
private ConfigItem<Map<String, String>> loadContextConfigurationFromFile(File configurationFile) {
String contextFileName = FilenameUtils.removeExtension(configurationFile.getName());
ContextId contextId = new ContextId(contextFileName);
ContextConfiguration contextConfig = new ContextConfiguration(contextId.toMetaData(), null);
return contextConfig;
}
private String[] getContextExtensions() {
String[] contextFileExtensions = { CONTEXT_FILE_EXTENSION };
return contextFileExtensions;
}
public void setStorageFolderPath(String storageFolderPath) {
storageFolder = new File(storageFolderPath);
if (!storageFolder.exists()) {
storageFolder.mkdirs();
}
}
}